Step1: Click on the tool in the webinar to which you want to add ThankYou Page as shown in the image below reading ‘Edit/View Webinar Details’.
Step2: Go to the ‘Webinar Registrations' tool as shown in the image below:
Step3: Open the ‘THANKYOU PAGE’ dropdown and enter the URL of the Thank You page and click on ‘SAVE NOW’ button as shown in the image below: